<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .router-link-active{
      color: red;
    }
    #news .router-link-exact-active{
      background-color: rgb(176, 216, 54);
    }
  </style>
</head>
<body>
  <div id="app">
    <!-- 视图定义 router-view组件 路由组件的出口 匹配路由组件就会在router-view位置处渲染 -->
    <router-link tag="button"  to="/home">到首页</router-link>
    <router-link tag="button" :to="{name: 'news'}">到新闻页</router-link>
    <router-link replace tag="button" to="/about">到关于我们页</router-link>
    <hr>
    <router-view></router-view>
  </div>
  <script src="./vue.js"></script>
  <script src="./vue-router.js"></script>

  <script>
    // 先准备  三个 路由组件  config
    const Home = {
      template: `
        <div>
          <h2>这是首页</h2>  
        </div>
      `
    }
    const News = {
      template: `
        <div id="news">
          <h2>这是新闻页</h2>  
          <router-link tag="button"  to="/news/native">国内新闻</router-link>
          <router-link tag="button"  to="/news/abroad">国外新闻</router-link>
          <hr/>
          <router-view></router-view>
        </div>
      `
    }
    // news子路由组件
    const NativeNews = {
      template: `
        <div>
          <h3>这是国内新闻</h3>  
        </div>
      `
    }
    const AbroadNews = {
      template: `
        <div>
          <h3>这是国外新闻</h3>  
        </div>
      `
    }
    const About = {
      template: `
        <div>
          <h2>这是关于我们页</h2>  
        </div>
      `
    }
    const NotFound = {
      template: `
        <div>
          <h2>404啦</h2>  
        </div>
      `
    }
    const routes = [
      {
        path: '/',
        redirect: '/home'
      },
      {
        path: '/home', // 路由path
        component: Home
      },
      {
        path: '/news',
        name: 'news',
        component: News,
        // 定义children属性 children定义子路由规则
        children: [
          {
            path: '/news',
            redirect: '/news/native'
          },
          {
            // 建议 携带父级路由地址作为前缀
            path: '/news/native',
            component: NativeNews
          },
          {
            path: '/news/abroad',
            component: AbroadNews
          }
        ]
      },
      {
        path: '/about',
        component: About
      },
      /* 
        vue提供了一个特殊的path * 可以匹配任意路由地址 优先级是最低的
      */
      {
        path: '*',
        component: NotFound
      }
    ]
    // 定义路由实例对象并 注册 路由规则
    const router = new VueRouter({
      // routes 路由规则
      routes
    });
    // 将路由实例 挂载到vm上
    const vm = new Vue({
      el: '#app',
      router
    })
  </script>
</body>
</html>